Nihon University(日本大学,Nihon Daigaku), abbreviated as Nichidai(日大), is a private research university in Japan. Yamada Akiyoshi, the Minister of Justice, founded Nihon Law School, currently the Department of Law, in October 1889.

The university comprises a federation of colleges and institutes known for having produced numerous CEOs of Japanese companies. The College of Art (日芸 — Nichigei), located right next to Ekoda train station in Tokyo's Nerima ward, is well known as it produces many artists who represent Japan in photography, theater, and cinema. In addition, the university has over 20 affiliated high schools bearing its name across Japan, from which a significant number of students go on to study at the institution as undergraduates.